If a scientist changed a cell's ionic composition and complementarity between DNA strands could no longer occur, what would the scientist first detect?
A) cell membranes would become less permeable
B) RNA would start binding to DNA
C) DNA strands become shorter
D) ribosomes would move into the nucleus
E) DNA becomes single stranded
Answer: E
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Sequencing technology and molecular phylogenetic analyses have had very little impact on our understanding of the evolution and diversity of life on Earth
Indicate whether the statement is true or false.
Which is a primary reason that females are at greater risk of a urinary tract infection than are males?
A. The urethra is shorter in women, therefore bacteria are closer in proximity to the bladder. B. The pH of women is lower due to a greater abundance of lactobacilli which can overcolonize the urethra and migrate to the bladder. C. Hormonal shifts in women can lead to overgrowth of genitourinary bacteria that eventually colonize the bladder. D. The urethra is longer in women, therefore more bacteria can colonize the pathway to the bladder.
Various techniques have been developed to isolate strains of bacteria carrying a particular mutation. One of them is, bacteria containing wild-type cells and cells of a desired mutant are grown on a medium lacking the nutrient for which the desired mutants are auxotrophic but containing an antibiotic that only kills growing cells. In this environment,
A. both wild-type and mutant cells are killed. B. both wild-type and mutant cells survive. C. wild-type cells survive; mutant cells die. D. wild-type cells die; mutant cells survive. E. only double mutants survive. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the bacteria? How does it relate to the question? · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The immunoglobulin/s found on the surface of B cells is/are
A. IgD and IgE. B. IgD only. C. IgM only. D. IgG only. E. IgM and IgD.